On motion by curvature of a network with a triple junction
The SMAI journal of computational mathematics, Volume 7 (2021) , pp. 27-55.

We numerically study the planar evolution by curvature flow of three parametrised curves that are connected by a triple junction in which conditions are imposed on the angles at which the curves meet. One of the key problems in analysing motion of networks by curvature law is the choice of a tangential velocity that allows for motion of the triple junction, does not lead to mesh degeneration, and is amenable to an error analysis. Our approach consists in considering a perturbation of a classical smooth formulation. The problem we propose admits a natural variational formulation that can be discretized with finite elements. The perturbation can be made arbitrarily small when a regularisation parameter shrinks to zero. Convergence of the new semi-discrete finite element scheme including optimal error estimates are proved. These results are supported by some numerical tests. Finally, the influence of the small regularisation parameter on the properties of scheme and the accuracy of the results is numerically investigated.

Published online:
DOI: https://doi.org/10.5802/smai-jcm.70
Classification: 65M12,  65M15,  65M60
Keywords: curve shortening flow, network, triod, Herring’s condition, Young’s law, semi-discrete scheme
@article{SMAI-JCM_2021__7__27_0,
author = {Paola Pozzi and Bj\"orn Stinner},
title = {On motion by curvature of a network with a triple junction},
journal = {The SMAI journal of computational mathematics},
pages = {27--55},
publisher = {Soci\'et\'e de Math\'ematiques Appliqu\'ees et Industrielles},
volume = {7},
year = {2021},
doi = {10.5802/smai-jcm.70},
zbl = {07342235},
language = {en},
url = {https://smai-jcm.centre-mersenne.org/articles/10.5802/smai-jcm.70/}
}
Paola Pozzi; Björn Stinner. On motion by curvature of a network with a triple junction. The SMAI journal of computational mathematics, Volume 7 (2021) , pp. 27-55. doi : 10.5802/smai-jcm.70. https://smai-jcm.centre-mersenne.org/articles/10.5802/smai-jcm.70/

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